Here is a fix to the problem of not being able to reply to comments on your Youtube videos ever since they started pushing the name change policy to use your Google+ name. Hope this helps many since Google still has not fixed this problem themselves.
YouTube Comment Reply Fix for Greasemonkey
Fixes the problem (bug?), that the reply button on youtube comments doesn't open the area to write the reply
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Post imported by Google+Blog. Created By Daniel Treadwell.